Description of UCM types
BMTX-SVN01C-EN 75
Tracer AH540 and Tracer AH541 air-handler controllers
The Tracer AH540 (factory-installed) and Tracer AH541 (field-installed)
air-handler controllers monitor and control Trane air handlers. They com-
municate on a Comm5 communication link. The Tracer AH540/541 con-
troller is configurable to operate in one of two air-handler temperature
control modes:
• Space temperature control
• Discharge air temperature control
If configured for space temperature control, the Tracer AH540/541 con-
troller uses the LonMark Space Comfort Controller (SCC) profile, and the
Tracer Summit object type is SCC. If configured for discharge air temper-
ature control, the Tracer AH540/541 controller uses the LonMark
Dis-
charge Air Controller (DAC) profile, and the Tracer Summit object type is
DAC.
Configure the control mode, either at the factory or in the field, with the
Rover service tool.
Tracer Loop Controller
The Tracer Loop Controller allows a Tracer Summit system to monitor
and control water-source heat pump systems. Tracer Loop Controllers
communicates on a Comm5 communication link.
Tracer MP501 controller
The Tracer MP501 controller is a configurable, multi-purpose controller
used to provide direct-digital control for HVAC equipment. The Tracer
MP501 communicates on a Comm5 communication link. It provides a sin-
gle control loop with the following output types: 2-stage, tri-state modu-
lating, and 0–10 Vdc analog. It communicates on a Comm5
communication link.
In SCC mode, the Tracer MP501 controls space temperature to an active
setpoint. SCC mode supports the following applications:
• Heating control loop
• Cooling control loop
• Two-pipe heat/cool automatic changeover using a communicated sup-
ply water temperature value
In generic mode, the Tracer MP501 provides control flexibility in a vari-
ety of applications that do not necessarily follow a LonMark
™ profile.
The control loop accepts inputs of the following types: temperature, pres-
sure, flow, percent, or parts per million (ppm). Generic mode supports
many applications including:
• Fan speed control based on duct static pressure
• Pump speed control based on water differential pressure or flow
• Humidifier control based on space or duct relative humidity
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